Pop culture has helped to keep this iconic British building from being destroyed.

Artists and musicians now rule over this former rail station.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

This unique shop is full of memento mori art, antique medical equipment, secret society paraphernalia, and historical relics.

The upstairs museum delves into the Lawson family murder, whose eight victims were embalmed at this store in 1929.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A kaleidoscopic warehouse-maze of handmade neon signs.

Although rarely used, there is still a hidden room for the royal family at the Stockholm central station.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

This poured-concrete water reservoir is a gem of modernist architecture well-hidden in a city forest.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

An abandoned tuberculosis hospital said to be haunted by the patients who died within its walls.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

A heavily politicized roundabout discussing the state of a heavily politicized country.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

This hidden collection of everyday objects illustrates life within communist Poland.

The world’s narrowest house makes for an awkward, four-foot-wide living space.